Im male. When i first got interested in computers(back when my age was a single digit), i didn't follow role models, i just got drawn to these machines, almost instinctively, and not just computers, cars, electronics, any kind of machines. I had my technical influence of course, my dad knew a lot about machines and electronics, but i think its something a bit deeper. Men have been making tools for hundreds of thousands of years, in my complete lack of experience in genetics, i think its foolish to dismiss genetic factors. Which is not to say that role models and culture have no effect, i just think that it has less of an effect than genes.
Bottom line is that my politically correct(i hope) opinion is that while women positively have the ability do be good developers(physicists, mathematicians, engineers), and even though some of them DO become good, most lack this internal drive(almost an obsession) I've had since before i can remember.